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Bioartificial materials based on blends of collagen and poly(acrylic acid)

✍ Scribed by Niccoletta Barbani; Luigi Lazzeri; Caterina Cristallini; Maria Grazia Cascone; Giovanni Polacco; Giovanna Pizzirani

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
141 KB
Volume
72
Category
Article
ISSN
0021-8995

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✦ Synopsis

The interactions between soluble collagen (C) from calf skin and poly-(acrylic acid) (PAA) were studied. Mixing aqueous solutions of collagen and PAA, at various pH values (2.5-4), leads to the formation of complexes that precipitate in the form of insoluble aggregates. The effects of mixture composition, pH, and ionic strength on C/PAA complex formation were investigated by gravimetric, turbidimetric, and conductometric analysis. The experimental results indicate that the complexes form through electrostatic interactions. Homogeneous solid films with variable C/PAA ratios were obtained by casting from solutions in which the pH was adjusted just over the isoelectric point of collagen, thus avoiding the attractive ionic interactions responsible for the complexation of collagen and PAA molecules. A relevant result obtained is related to the possibility of restoring the ionic interactions between the two polymers inside the solid films. Mixture composition and pH appear to influence the thermal properties of both complexes and films.

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